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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '073f0604e4fe1a00a1c1e716223a4046a0f572a3aa42f8ffe61382c4bc042c02' 
  AND token = 'N/8lysvZmu7kZ5lLRi13mNU8cda2OUoSBUW5j9sONVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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