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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87bc5d64200192f8caaab4e270978ba88e838c45c17069902d49587decbc2f96' 
  AND token = 'iETEMG2Tl0qqZYU3EVrMJ1Ie0GMjU67Iu8qMXJ2M3U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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