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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6152ae62eb58bbe2f8b7eb576add6102714441cfbe5d1d7a14686866f1a6996' 
  AND token = 'XmIJeK+lTfEJ0H3ZgOdi/zTAiPDFlC42X/i2yhfICrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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