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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3790ef312972305d0850a87c935373e7ec5c4611fac9fe60e1bdb6e53bb84fb4' 
  AND token = 'SDPWsX+MKJN9Q8GK4OQ6l9mlmprR/B3Axc9ZAUW7arI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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