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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ac031732761724ed55f765391768d1d6df0a21666ca27ed6687bce43586020' 
  AND token = 'Pe/SLDM0x+h354nOWgWKQXFR0gKmppgoSqPcqI1yo48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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