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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e37bc52e141dbeb02b3b32ee9b2a5b96b98ba1d238f563ace2ffb44deceeafaf' 
  AND token = 'NFmGYAMfZ6jISF/reuldPRRyETgsg/21Xc2xDsuGQRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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