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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7e463e0da5e6a091acf7428ce2e14890450c78bbdc40e005315c6422d6295a6' 
  AND token = 'S6O2z7P0ZXm0Dnwo2Cd8CM66GusfF1ZUS3/X8gQF16E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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