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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd097d9bc0b4f2597b018058de9072bdaf68765872f730abfc12eea9fe52610cd' 
  AND token = '6q2Ypynu0bP5wpKvuSkl267zW8BZGSd1Bb5hHIQ5Li0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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