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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '198eb76549b77f27df4a6945d89a2cf9ae902ede773dc3f7233535d186835d40' 
  AND token = 'o7urrPoeVzYn1SWNDFMpA2b1o1e2tat8Ccuo8HaWboo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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