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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52b3e925b9b1468491a22d9e5a3b4dfbe2bd6ff51732872e1aa5e2a293f6e578' 
  AND token = '8dBDlBegAS8vvP1EmZ293uYzbWphjALL2vZAL1a6n4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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