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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a67fd7e076fe33bf8eb450f12bf74c905a034ffd9fd605b6f2bec65d73db651c' 
  AND token = 'JdZcR92PrWpCgbx8RsaH7oibRP50QTAxoQD+uvKnIGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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