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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '751f41bd28f2c412515d320c12ddb0aae6b2a0c8e753f2c74a923c2779ec4707' 
  AND token = 'TFv9Fvxl11PCAWCVuyD0xd6EsB3yyztQI68LoFws1kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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