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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b4912f31afc30ac0a5a72f767f4e2629ca638dfcbc19e2bb3c32a30004b668f' 
  AND token = 'LB8rAhLdEX2XNk7/+iQXR4HLfCd94luGaer5AqTDWRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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