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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e900efb74c2c80a6298c805e23be0cbeb537ad12ba9a878ae2fd9394bc422113' 
  AND token = 'bvuw3RowwCAAgJPHEvyimvWg5tld40Pt3880UrAtpA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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