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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dce45edeb55be90e976611f8dbedc29ceb5c034269ad6e4c43a92e5c1aa3edda' 
  AND token = '+vQBtS/ziJHvsxyfs4s0qpCGGvoIjW05XE+Wc7UN+5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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