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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17e933a2de16317785dc93ded20c23a3e9a5b55d778cb1b9310b1793418423e0' 
  AND token = '0aMNYaOoB/LyRXBjxvVACRW9cBx6ilO+5OjH2IaDsJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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