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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '929c0196aa25c28ba4f868d89ea89c4dbcfa2e67663a90807b3596dc4339a6bc' 
  AND token = 'dNbtwgEciV0A6iPQfpDgl6J8zJs/RFrBRVolIW75r7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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