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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b05fa585650913c31a5ab7cefc9414f88a4c355cbd016bc78fb983037c7ce6fa' 
  AND token = 'pvtqfZSkkIbKECrAFRbVIDTlNCDEOlX1vUCADf8g6Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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