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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '071a0d486623c92406dc9b8382b42d8efa4fe35960a76ad14fe369e52ccf4f44' 
  AND token = 'I6i15QZYVNLFL0b+ZYEd3DMNVqTbhNnkDpU4Ts2QnHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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