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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f873376f78826cd1587b0277427247e4b53c031a9c90771202d012f46625da48' 
  AND token = 'WBUsBxfoJdfLOExBCk7j2tPu3Ce96/3KyKIo7Q2z6Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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