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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd08a580346e9fe2aaf63028523835532bffd5c6f6a1f12b6a336c24d80229b1e' 
  AND token = 'dRxxu6eqnwW2KvUEzmOB1ucEBpI42XL2FbhmpsKoics=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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