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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf46ce75510433c4446e8ec01b8f8717763095c9e5e82c03f203500f7c556989' 
  AND token = 'CfIHapjljImqlcWh+Uq7OqZLt71h1+shOPMG2ZpFsf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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