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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9829fd04a64038eef871374aa7753c7baf99790c0c8bb9f608a8ea54565447d0' 
  AND token = 'MnTDENkl2xByxd1vId+VR8Fz2iJeuZ374235z00Kbk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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