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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db912a05df1d1c06ac27dc29252c1adb1113c99923e85fd977b1ea729b5979d5' 
  AND token = 'K6jU28WzFaNJTBfTnB78BmSQ3fv43co7njqyLX4HB7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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