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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c63128170a3d69648510aacf35b8b66961f1a41790d5b04829939b6d49aca07' 
  AND token = '6SKr1mbsgi1GGPc1pPLerZLPH2/7ezYN17+rVI56wYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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