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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3192b1314bcdc8b9ed82ac9a731747f61cc3022a899782a209bf1cd8af569d60' 
  AND token = 'cAqjkikGm6QSQ+RBRKkYf8retbJQ3VPr4ecY4nlgmps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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