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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86415c15ffee9a5b72f5041762a2a7ec3830fedfb8fd623a87d5380f0c98ce59' 
  AND token = '8MDPGh256QNltha3xsdl/bghrp1opMzOMhjaSiGBL+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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