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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6176d7d4fcf241b3998ab1d0eef87153ebb2a193eb9235d5c7b05ae0c71b270' 
  AND token = 'OteydRtZthRpOyE5kVS0q8xrBGrBDX7RrAf+Danlv44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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