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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c63940d60b3a8703fe677071de2a3daab4eb2b06280cc353d00dae39388f7adf' 
  AND token = 'hL+htbeCVEbi8gXV5rMl51IrS2yc+xg9WGuEg/YJko4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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