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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '205b59509d0e164692d932f5d2bd18770d9b420723c04a3af4d25b01e64008b7' 
  AND token = '/C3Ahap5ZpdvxyH7V975shX9Ok7JZ+q634+i5o/uAhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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