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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a533c3c6043e16ea5e00b361bdb676b71cb8f3026ffba454d8bd94ad28f1920' 
  AND token = '17kg/o9nuJiiX0PdDf6Y+RRho6+47p5eKV9XC9ZfbYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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