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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0585acbf411b4161edd74ed5e0902bc37ef6189d374c08023df7f43173651a57' 
  AND token = 'hwSEN7TimtnGfOPClcXpAL5ZTi1F2pNOs0f81tBiED8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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