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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5efbbbd1786d939d3335be01bbcb04ae1f1bc2f826cf3f283a9fc00e7634777f' 
  AND token = 'gPkPnBFU44eHZgq92rb/OmW+WpMYPxCPaqNSIP0SSw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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