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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2799c27539d4ba7250cad64bb8a81fdc94beb04ceec8209b517b2609040f2a0f' 
  AND token = '1vCCUsfbVj8k30fCDn7yYVUjoL58dBExINQ3JPjzNgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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