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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f297a9592303abee90230655eb94ed79b726d6adc0b1bc2ba784659c1f82705' 
  AND token = 'ZKw/cpT/6y5qC6rQjCZuIV4fw+coBH09y2899mSco5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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