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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f5c11ab67d6a4c624337dbda6dcacec830ce058a9ff4dea15f6914560d61bdd' 
  AND token = 'CIFdHFMBd6omjiHWCm6BA+88IPdJdVz0eXe3+8gb56g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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