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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e8c1cd27cc6f79ea8da9c9a2a41e0349ebaf3d9f05e2fd0efebed453d26e854' 
  AND token = '1DD51d3pLdUKHfeRKZAhZ6OHzix+tIW5xfER0JQij0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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