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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbb1b8456b8cd3a40ee36788bb48cc85c70965cd126375ebd5635c080c2e2fa3' 
  AND token = 'YQcpasg3+T+4uLSr1QU0FS78zyKuZ8x89DxKYjv/K7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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