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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4461ba3f98c17745d95dd74340fc7dfefc236805eef914150d6c6f9c289ca19b' 
  AND token = 'SIgtFP89d9cdQlkq9AwaR0aTWXBrbMI4brtdVdS/HqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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