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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b22dc203db65e33b7e693767def3c82a605d470f68b9bf817ee02b58a916974' 
  AND token = 'Y1jmTpdfgw4I6dolZ1WcLRF12v2s/dTLfWWrfYLxIOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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