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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7576480b19444dd021ce1bb30563dd7a5e7c265d40e085ff54dff451f33a8cd' 
  AND token = 'R5hCOYzHLzVLAVP9uFTrKArEViNyOsm8eusKlAfVALs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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