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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74ae45e730d998ab618ece27e8dcafc268ea62f129dd39ad29aed9aa6a1ea013' 
  AND token = 'vEm3e+sLnCzXPJakb2nJ0noWH0C+JOFzyO5TiPASz5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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