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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecbe2ef6077d200256fff7f632f15b09d82f427dbcb8b565137693452c0654d8' 
  AND token = 'u2/Q6+eIxUyZHsZWiRbPeAh7C9imJ1fat9hgSvCn8xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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