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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ea21deb2f27d9e868e804e873bb79300b6edfd97044478d53bc1ef6a178e934' 
  AND token = 'OGSy9T047G/oUr3td+ecW1S3JwuUX18kQmklreKsyjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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