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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43267fdc0f6f5ef7fdeeb2e2878e08a36286835a932d3b37384b5291db61fbd7' 
  AND token = '/1qlIsNyGV0CChEXgFw2bg8yl5AEi/n4sNTr01Ia3qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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