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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c48b74358a98e14f35d2ff1f248808f22a453a1ec38a1fbddc5d4c323a928282' 
  AND token = '5pH/dIBJqW+pJB+Wuewhrtyl0jUcX/IHTBk9xxrXfaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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