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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b18400fa56def704ef80fb44c18e04af7bd534b9e728bad90b890c19d583a35c' 
  AND token = '/x2rAR6Bxg2PfTdeKKCexl1Z6s58HL1axqqyw5nkrX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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