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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc6f9882902201c22aec946da90db2c2c5cf44a5fb55fec73c478b4d0c988036' 
  AND token = '8J2ANNM0vkqA23YbLNfIbXlRD22HwJ6afzFc6thdXq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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