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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c276bc7d74a72d5596a55bd9e04cafe8fcafbef703aff29b2f75e3c1cbdd4a1d' 
  AND token = 'hNBPfhWeiw2fUTEGiIueeXLs+lyFCasZqQc1bBH6M1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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