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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '477733dbea5f56b965d45d86a846043885fd1485d364c07298c73677837b5c89' 
  AND token = '1siRd1t8TFy4JZjzGMN4HoZYZfgddUzvxadcw2Z8O/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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