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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca3a972abab6a4d7fb0cd18e6235badaf1b26eccccc7fd0148db31e0d9c2938f' 
  AND token = 'yI7sFgYkYi41EHHNOTuPM2a77WUG+3CTBpX+7RuSCfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}