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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24e804053b4d3169f83ea4f7932dd237a433be039e2bea5573493f0b3be8cfa6' 
  AND token = 'm3+hAE5JLG9hp5FgAhZJTvnC39DdL2BNsMeDObZUbaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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