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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e0e8f57dfc2a221e779ba71cbc24fa1ecbb7e86452aeed836db39062bafc8e0' 
  AND token = 'izYRL/UZ5vbLHYwbhcirujzNeM3Ks1PL0s6g4F1mYbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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