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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ef4a0f6217bc79c2fab9b0b754cad70c0d9f33dad50cf6baaef2a6c283bbd19' 
  AND token = '+maWY/vvi2kkQtM1jMN7SLeSrXOLX/Xk+h2RQYtbuuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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